This guide provides strategies for focusing remediation efforts on 1) the change in contaminant
mass flux in different subsurface transport compartments (e.g. the vadose zone, smear zone or a
zone within an aquifer of interest) and 2) the change in remediation timeframe.

In this approach, groundwater flow and contaminant concentration data are combined to estimate
the rate of contaminant mass transfer past user-selected transects across a contaminant plume.
The method provides the user with a means to estimate the baseline mass flux and remediation
timeframe for various transport compartments and then evaluate how different remedies reduce
the mass flux and the remediation timeframe in each transport compartment.

Related articles

A one-dimensional vadose zone model was used to simulate flow under natural boundary conditions. The effects of hysteresis and temporal variability of meteorological conditions were evaluated. Simulations were performed in HYDRUS-1D code for the period April 2013–January 2014 (6601 hours) at three different locations in a delineated portion of the sub-quaternary catchment A80A of Nzhelele with different soil textures. Soil hydraulic characteristics were estimated in a Rosetta library dynamically linked to the...

Moisture distribution in vadose zone soil is the most important parameter for land productivity and vegetation status of ecological systems, and is sensitive to temperature variation. In this study, laboratory scale tests were conducted to determine the effect of temperature on variation in moisture distribution in covered and uncovered conditions. The results indicated that soil moisture from 2.65 to 20 cm was positively correlated with temperature and temperature gradient, and the top 2.65 to 5 cm was dramaticall...

Understanding soil water dynamics and accurately estimating groundwater recharge are essential steps in achieving efficient and sustainable management of groundwater resources in regions with deep vadose zones. The objective of this study was to understand transient data and the dynamics nature of water from deep sections at the thick vadose zone, and to estimate groundwater recharge by applying Darcy's law of unsaturated water fluxes. The study was conducted during year 2009–2013 at Luancheng Agro-ecosystem...

In this study, diesel was selected as a pollutant to study the migration and distribution rule of light non-aqueous phase liquid (LNAPL) in the simulated vadose zone. Saturation was regarded as a critical parameter to reflect the LNAPL migration and distribution rule. To get LNAPL saturation distribution figures, an image processing method of saturation was established to improve light-transmission technology, which can deal with digital camera images. Results showed that the vadose zone contains three areas from...

The Loveland Sinclair gasoline station was selected for In-Situ Thermal Remediation (ISTR) using Gas Thermal Remediation (GTR) technologies. The GTR remediation system was designed to target a treatment area of approximately 14,000 square feet and includes a treatment volume of approximately 3,100 cubic yards. Vadose and saturated zone impacts, including a thin layer of light non-aqueous phase liquid (LNAPL) will be treated to drinking water standards.
Geology: Clay, Silty Clay

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